Explain step by step please

Problem 4.84 Three couple moments act on the pipe assembly as shown in (Figure 1). M1 = 75 N . m. Figure 120 120 120 Part A Determine the magnitude of M2 so that the resultant couple moment is zero. Express your answer to three significant figures and include the appropriate units. A M2 = Value Units Submit Request Answer Part B Determine the magnitude of M3 so that the resultant couple moment is zero. Express your answer to three significant figures and include the appropriate units